Washington: Three days after the voting ended, the race for Democratic delegates in Super Tuesday's contests was still too close to call.

With nearly 1,600 delegates from Tuesday contests awarded, Senator Barack Obama led by two delegates on Friday night, with 91 delegates still to be awarded.

Obama won 796 delegates in Tuesday's contests, to 794 for Senator Hillary Clinton, according to an analysis of voting results by The Associated Press.

In the Republican contest, Senator John McCain had a commanding lead in the race for delegates.

Nearly a third of the outstanding delegates are from Colorado, a state where Obama won the popular vote.

California, a state that Clinton carried, had 20 Democratic delegates still to be awarded. Neither state expected to have complete results before next week. Obama won the popular vote in 13 states on Tuesday, while Clinton won in eight states and American Samoa.

Magic numbers

In the overall race for the nomination, Clinton has 1,055 delegates, including separately chosen party and elected officials known as superdelegates. Obama has 998.

A total of 2,025 delegates are needed to secure the Democratic nomination.

Many delegates were outstanding because some states have been unable to provide all the votes in some congressional districts. The problems arose in states with counties that are split into multiple congressional districts.